Sharp QTCD-111, QTCD-111-C Service manual

QT-CD111/111C

SERVICE MANUAL

No. S3819QTCD111/

QT-CD111

QT-CD111C

Illustration: QT-CD111	• In the interests of user-safety the set should be restored to its
	original condition and only parts identical to those specified should
	be used.

CONTENTS
	Page
IMPORTANT SERVICE NOTES (FOR QT-CD111 ONLY) ................................................................................................	2
SPECIFICATIONS .............................................................................................................................................................	2
NAMES OF PARTS ...........................................................................................................................................................	3
DISASSEMBLY ..................................................................................................................................................................	4
REMOVING AND REINSTALLING THE MAIN PARTS .....................................................................................................	5
ADJUSTMENT ...................................................................................................................................................................	6
BLOCK DIAGRAM .............................................................................................................................................................	8
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD .............................................................................................	10
NOTES ON SCHEMATIC DIAGRAM ..............................................................................................................................	16
TYPES OF TRANSISTOR ...............................................................................................................................................	16
WAVEFORMS OF CD CIRCUIT ......................................................................................................................................	17
TROUBLESHOOTING (CD SECTION) ...........................................................................................................................	18
FUNCTION TABLE OF IC ................................................................................................................................................	21
PARTS GUIDE/EXPLODED VIEW
PACKING OF THE SET (FOR QT-CD111 ONLY)

SHARP CORPORATION	This document has been published to be used
	for after sales service only.
– 1 –	The contents are subject to change without notice.

QT-CD111/111C

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL.

IMPORTANT SERVICE NOTES (FOR QT-CD111 ONLY)

BEFORE RETURNING THE AUDIO PRODUCT

(Fire & Shock Hazard)

Before returning the audio product to the user, perform the following safety checks.

1.Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the audio product.

2.Inspect all protective devices such as insulating materials, cabinet, terminal board, adjustment and compartment covers or shields, mechanical insulators etc.

3.To be sure that no shock hazard exists, check for leakage current in the following manner.

*Plug the AC line cord directly into a 120 volt AC outlet.

*Using two clip leads, connect a 1.5k ohm, 10 watt resistor paralleled by a 0.15μF capacitor in series with all exposed metal cabinet parts and a known earth ground, such as conduit or electrical ground connected to earth ground.

*Use a VTVM or VOM with 1000 ohm per volt, or higher, sensitivity to measure the AC voltage drop across the resistor (See diagram).

*Connect the resistor connection to all exposed metal parts having a return path to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor.

VTVM

AC SCALE

1.5k ohms

10W

0.15 µ F

TO EXPOSED

TEST PROBE CONNECT TO

METAL PARTS

KNOWN EARTH

GROUND

All check must be repeated with the AC line cord plug connection reversed.

Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp. AC.) or more is excessive and indicates a potential shock hazard which must be corrected before returning the audio product to the owner.

SPECIFICATIONS

General		Tape recorder
Power source:	AC 120V, 60 Hz	Frequency response:	50 - 14,000 Hz (Normal tape)
	DC 12 V [ "D" size (UM/SUM-1,	Signal/noise ratio:	50 dB
	R20 or HP-2) battery x 8]	Wow and flitter:	0.25 % (WRMS)
Power consumption:	20 W	Motor:	DC 12 V electric governor
Output power:	FTC; 2.0 W min. RMS per channel	Bias system:	AC bias
(111)	into 8 ohms from 150 Hz to 20 kHz,	Erase system:	Magnet erase
	with no more than 10 % total harm-	Compact disc player
	onic distortion.
	RMS; 2.3 W (1.65 W + 1.65 W)	Disc:	Compact disc
	(DC operation, 10 % T.H.D.)	Signal readout:	Non-contact, 3-beam semi-
Output power:	RMS; 2.3 W/CH		conductor laser pickup
(111C)	(DC operation, 10 % T.H.D.)	Audio channels:	2
Speakers:	4" (10 cm) full-range speaker x 2	Quantization:	16-bit linear quantization
Dimensions:	Width; 18-15/16" (480 mm)	Filter:	4-tims oversampling digital filter
	Height; 6-1/16" (153 mm)	D/A converter:	1-bit D/A converter
	Depth; 10" (254 mm)	Wow and flutter:	Unmeasurable
Weight:	7.1 Ibs. (3.2 kg) without batteries		(less than 0.001% W. peak)
Radio
		Specifications for this model are subject to change without
Frequency range:	FM; 87.6 - 108 MHz
	AM; 530 - 1,702 kHz	prior notice.

– 2 –

1.Cassette Compartment

2.CD Compartment

3.Tuning Control

4.(TAPE) Record Button:

5.(TAPE) Play Button:

6.(TAPE) Rewind Button:

7.(TAPE) Fast Forward Button:

8.(TAPE) Stop/Eject Button: /

9.(TAPE) Pause Button:

QT-CD111/111C

NAMES OF PARTS

1 2

3

4 5 6 7 8 9

10.(CD) Play Indicator:

11.(CD) Track Number Indicator

12.(CD) Repeat Indicator:

13.Volume Control

14.Function Selector/Power Switch

15.Extra Bass Button: X-BASS

16.(CD) Track Down/Review Button:

17.(CD) Track Up/Cue Button:

18.(CD) Stop Button:

19.(CD) Play/Repeat Button:

10 11

12

13 14 15

16 17 18

19

20. FM Telescopic Rod Aerial 20

21. Battery Compartment

22. AC Power Input Socket

21 22

– 3 –

QT-CD111/111C

DISASSEMBLY

Caution on Disassembly

Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure excellent performance:

1.Take cassette tape and compact disc out of the unit.

2.Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit.

3.Take off nylon bands or wire holders where they need be removed when disassembling the unit. After servicing the unit, be sure to rearrange the leads where they were before disassembling.

4.Take suffcient care on static electricity of integrated circuits and other circuits when servicing.

STEP	REMOVAL		PROCEDURE		FIGURE
1	Rear Cabinet	1.	Screw .................	(A1) x10	4-1
		2. Socket ..................		(A2) x1	4-2
2	Top Cabinet	1.	Knob .....................	(B1) x1	4-2
	(with CD Mechanism/	2.	Screw ...................	(B2) x3
	Tape Mechanism/	3.	Socket ..................	(B3) x1
	Main PWB)
3	Main PWB/	1.	Screw ...................	(C1) x6	4-3
	Switch PWB	2.	Socket ..................	(C2) x4	4-3,4-4
4	Tape Mechanism	1.	Screw ...................	(D1) x4	4-4
5	CD Mechanism	1. Screw ...................		(E1) x3	4-4
6	Terminal PWB	1. Screw ...................		(F1) x4	4-5
		2.	Hook .....................	(F2) x1

Front Cabinet

(A1)x6

ø3x20mm

(A1)x3	Rear Cabinet
ø3x12mm

(A1)x1

ø3x12mm

Figure 4-1

Top Cabinet

(B1)x1

(B2)x3	Main PWB
ø3x10mm	(A2)x1
	(B3)x1

Front Cabinet

		(C2)x1
	(C1)x5	Switch PWB
	ø3x10mm

Main PWB

Top Cabinet

(C1)x1

ø3x10mm

Figure 4-3

(D1)x4 ø3x10mm

(E1)x3

ø2.5x10mm

Tape

Mechanism

(C2)x2

Top Cabinet

(C2)x1

CD Mechanism

Figure 4-4

(F2)x1

Push

Driver

(F1)x2 ø3x10mm

Terminal PWB

(F1)x2

ø3x10mm

Figure 4-2

Figure 4-5

– 4 –

QT-CD111/111C

REMOVING AND REINSTALLING THE MAIN PARTS

CD MECHANISM SECTION

Perform steps 1, 2, 3 and 5 of the disassembly method to remove the CD mechanism.

How to remove the pickup (See Fig. 5.)

1.Remove the screws (A1) x 2 pcs., to remove the shaft (A2) x1 pc.

2.Remove the stop washer (A3) x1 pc., to remove the gear (A4) x 1 pc.

3.Remove the pickup.

	(A1) x2
	2.6 x6mm
Pickup	CD
	Mechanism

			Stop
	Shaft		Washer
		Gear	(A3) x1
	(A2) x1
		(A4) x1

Figure 5

– 5 –

QT-CD111/111C

ADJUSTMENT

MECHANISM SECTION

• Driving Force Check

Torque Meter	Specified Value
PLAY: TW-2412	Over 120 g

• Torque Check

Torque Meter	Specified Value
Play: TW-2111	25 to 65 g.cm
Fast Forward: TW-2231	60 to 130 g.cm
Rewind: TW-2231	60 to 130 g.cm

• Head Azimuth

Torque Meter	Specified Value
MTT-114	Output: Speaker Terminal
	(CNP201 Load resistance: 8 ohms)

• Tape Speed

Test	Adjusting	Specified	Instrument
Tape	Point	Value	Connection
MTT-111	In motor	3,000 ± 90 Hz	Output: Speaker
			Teaminal
			(CNP201 Load
			resistance: 8 ohms)

TAPE SECTION

Position of each switch or control

Volume control	Max
Function switch	Tape/Power Off
X-BASS	On

• Bias Oscillation

Adjustment Point	Specified Value	Instrument
		Connection
L301	82 kHz ± 6 kHz	Pin 2 of CNP201
	– 6 kHz

• Playback Amplifier Sensitivity Check

Test Tape	Specified Value	Instrument Connection
MTT-118	1.8 V ± 3 dB	Speaker Terminal
		(Load resistance: 8 ohms)

MAIN PWB

AM
TRACKING				FM ROD ATENNA
fL
				VR1
			VCO
					13
L3	ANTENNA	FM		T2	1917 IC2	T3
						1
		DETECTION			21
	BAR		L4	L2		AM IF
AM			TC4		IC1	T1
				TC2
			TC3	TC1		FM IF
		AM		L1	1
		TRACKING
		fH
fH	fL		fH	fL	fH	fL
AM BAND			FM		FM BAND
COVERAGE			TRACKING		COVERAGE

TUNER SECTION

fL: Low-range frequency fH: High-range frequency

• FM IF/RF

	Test Stage	Specified	Instrument
		Value/Adjusting	Connection
		Point
	IF	T1	Input: Pin 1 of IC1
			Output: Pin 17 of IC2
	Detection	T2
	Band Coverage	fL: L2	Iuput: Antenna
		fH: TC2	Output: Speaker
			Terminal (CNP201
	Tracking	88.0 MHz: L1
			Load resistance: 8
		108.0 MHz: TC1
			ohms)

• AM IF/RF

Test Stage	Specified	Instrument
	Value/Adjusting	Connection
	Point
IF	T3	Input: Antenna
		Output: Pin 19 of IC2
Band Coverage	fL: L4	Input: Antenna
	fH: TC4	Output: Speaker
Tracking	600 kHz: L3	Terminal (CNP201
	1,400 kHz: TC3	Load resistance: 8
		ohms)

• VCO Frequency

Adjusting Point	Specified	Instrument
	Value	Connection
VR1	76 kHz ± 200 Hz	Pin 13, pin 21 and
		ground of IC2

Note:

After preparing the test circuit shown in Fig. 6-1, connect the Pin 13, Pin 21 and ground of the IC2 with the test circuit, and measure the value. At this time, apply a standard unmodulated signal input and adjust the VCO.

Pin 13 of IC2 Pin 21 of IC2
G	D	FET : 2SK19 or 2SK54
	S		TO FREQUENCY
			COUNTER

10 kohm

Figure 6-1 VCO FREQUENCY TEST CIRCUIT

Figure 6-2 ADJUSTMENT POINTS

– 6 –

QT-CD111/111C

CD SECTION

Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is necessary to reajust it.

Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.

TEST MODE

	Start	While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD".
		Then, release the "STOP" button and, within 0.5 second, connect the TEST POINT to GND (within 0.5 second).
		(See Fig. 7)
	Note	1. When the CD LID switch is in the OFF position, the unit will be able to enter the test mode.
		However, playback cannot be performed in this mode.

2.You can only move the pickup.

3.The LCD display should be the same as it is for normal CD operations.

	Operation	1	The use of the "UP/CUE" button will move the pickup to the outermost position.
			The use of the "DOWN/REVIEW" button will move the pickup to the innermost position.
		2	When the "PLAY" button is pressed, the laser will be lit, and when the "STOP" button is pressed, it will be
			turned off. Playback will also start and stop when these buttons are pressed.

a.If the "PLAY" button is pressed while in the stop mode, the laser will simply be turned on at first.

b.If the laser is lit and the "PLAY" button is pressed again, playback will start from the current pickup position.

c.If the "STOP" button is pressed, playback will stop. When pressed again, the laser will be turned off.

3Turning the tracking servo on or off.

a. Each time the PAUSE button is pressed during playback, the tracking servo will be turned on or off. (Note: If the PLAY button is pressed while in the stop mode, the tracking servo will automatically be turned on.)

LCD MODE

	Start	While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD".
		Then, release the "STOP" button and, within 0.5 second, press the REVIEW/DOWN button.
	Display	1		2				3

1 second

1 second

*After the number 3has appeared in the display, each time the "UP/CUE" button is pressed, the display will switch in the following order: 1, 2, and then 3.

SWITCH PWB – A2

R771	SW774
	TRACK DOWN/
3.9K	REVIEW
R772	SW773
2.7K	TRACK UP/
TEST	CUE
POINT
R773
1.8K
	SW771
R774	PLAY
1.5K
R776	SW7712
10K	STOP
	+B
	3	1

TO CD SECTION

Figure 7

– 7 –

(1/2) DIAGRAM BLOCK 8 Figure – 8 –

24

27

28

31

34

35

36

										CD LID
										OPEN/CLOSE
										SW761
									CD
							OPERATION
									KEY
						SW771~SW774
LCD701			RX771
CD LCD		REMOTE
		SENSOR
			3 2 1							PICKUP UNIT
						X701
						4MHz
57 ~ 60		41 ~ 44		30	33	22			23
SEG4	SEG1	COM3	COM0	RC IN	K1	XIN		XOUT
								LID 37
		IC701					VLC3 38
	IX0105AW
							VDD 25
		SYSTEM							+5V	FOCUS COIL
	MICROCOMPUTER
									(D)
		RES		SL–	DRF	WRQ	RESET	SL+ 13		TRACKING COIL
								SL– 14
		9	~ 14 17 ~ 19 21						20

		LASER	+5V
		DRIVER
		Q805
			64	62
	1	FIN2	VCC1	LDO
	2	FIN1
	3	E
	4	F
			IC801
		LA9240M
		SERVO AMP.			SLI	44
				SLC		43
				CV+		40
		TO FD SPO SLEO	SLD	THLD/DEF CLK CL DAT	CE DRF	~
	30					32
		SL–			JP–
	31	SL+
		15 16 27 28 29		49 50 51 52 53 54

	XL801		+5V
	16.93MHz
	44	45	6 23 43
	XOUT	XIN	VVDD VDD XVDD		63
					64
					62	1	R-CH
9	EFMO				51
		IC802				2	GND (A)	TO
10	EFMIN
12	CLV+	LC78622E		LCHO 37		3	L-CH	MAIN
13	CLV–	SERVO/SIGNAL			+7.4V	4	+7.4V (D)	SECTION
14	V/P	CONTROL			(CD)	5	GND (D)
15	HFL					6	POWER GND
16	TES				46
17	TOFF				39
18	TGL				38
19	JP+				33
20	JP– RES. CQCK. COIN				32
	SQOUT. RWC. WRQ
	1 61 58 57 56 55 54 53		2 4	8 11

CL, DAT, SELIAL CONTROL

					CONSTANT
					VOLTAGE
				+5V	REGULATOR
				Q804
				3 10 19 23 25
			1	IC804
	M701		2		22	+7.4V
PICKUP IN		M	11	BA5914FP
	SPIN		12		5	2
SW702	MOTOR			FOCUS/TRACKING
					6
PU-IN SW			17
			18	/SPIN/SLIDE	7
	M702	M	26	DRIVER	8
	SLIDE		27		13
					28
	MOTOR

CD111/111C-QT

(2/2) DIAGRAM BLOCK 9 Figure – 9 –

FM ROD ANTENNA

IC1

AM IF

455kHz

FM DET

VR1

LA1186N

T1

CF

T3

CP

T2

AM / FM VCO

TUNER

FM FRONT END

7

FM IF

10.7MHz

SELECT

+B

RF AMP

+B

F1

1

MIX

OSC

B.P.F

IC2

1

3

2

5

20

17

15

11 13

15

14

7

21

VCC

4

LA1805

VCC

2

3

5

9

6

8

FM / AM

PILOT

ST.

DET.

POST

TRIG.

IF MPX.

FM - IF

DET.

DRIV.

AMP.

FM

22

RF

MPX

LEVEL - DBT.

MUTE

FF

L1

+B

L2

FM RF

FM OSC

AM - IF

DET.

PHASE

VCO

FF

FF

DET.

TU

23

REG.

OSC

AGC

DRIV.

DECODER

ST.

L3

SWIT.

AM BAR ANT.

GND

FROM	1	R-CH
		(AUDIO GND)
CD
SECTION	2	L-CH	CD
	3	+7.4V
	4
		+B2
	5	(DIGITAL GND)
	6	(POWER GND)

REC / PB

		SW102
		C,E
	P.B	P.B
	L-CH	SW102
	REC / PB
		REC / PB
	HEAD	B.D
	R-CH
	ERASE
	HEAD	SW102-H
		REC / PB

POWER/

FUNCTION RADIO

SW201-A,B

	TAPE
EC / PB	REC
SW102
A,F

P.B 5 L	L	1 P. B
9 R	R 12REC
REC
IC101		6
EQULIZER
AMP.
BA331IL		8

REC

	C201	+B1
	L201
		M601

BIAS	SW102-G	TAPE
OSC.	REC / PB	MOTOR

24

6

4

12

8

19 18

9

10

L5

AM OSC

X-BASS VOLUME

SW202

A,B VR201

A,B

STANBY

VOLTAGE

REGULATOR

	IC203	+B1
	KIA7808P
		SW201-C
		POWER/
		FUNCTION
SW201-D	+B2	AM / FM
		SELECT
POWER /
		+B
FUNCTION
		FM +B

D651~D654

RECTIFIER

SW601

MAIN

IC501

LA4597

POWER AMP.

2 L		12
6 R		10
5	11	8

T651 POWER

TRANSFORMER

SP501

L-CH

SPEAKERS

SP502

R-CH

SO651

AC INPUT

AC 120V 60Hz

					BATTERY
TUNER					DC12V
+B			[' D' SIZE (UM/SUM-1,
	R20 or HP-2)BATTERYx8]

CD111/111C-QT

QT-CD111/111C

A

B

C

D

E

F

G

H

IC701

PIN

VOLTAGE

PIN

VOLTAGE

NO.

NO.

1

0V

33

5V

2

0V

34

0V

SWITCH PWB-A2

3

0V

35

0V

4

0V

36

0V

5

0V

37

0.4V

6

0V

38

5V

SW774

Q805

7

3.9V

39

3.1V

TRACK DOWN/

8

0V

40

1.5V

REVIEW

SS9012H

9

5V

41

2.4V

R771

3.9K

+B

10

4.1V

42

2.4V

SW773

11

4.1V

43

2.4V

R842

12

0V

44

2.4V

TRACK UP/ CUE

C849

13

0V

45

2.4V

R772

22

2.7K

0.022

15

0.4V

47

2.4V

14

0V

46

2.4V

16

0.4V

48

2.4V

R773

2.7K

SW771

C848

17

0V

49

2.4V

PLAY/

1/50

18

0V

50

2.4V

REPEAT

19

0V

51

2.4V

+B

20

0V

52

2.4V

R774 2.7K

STOP

CD LID

22

2.5V

54

2.4V

21

5V

53

2.4V

SW772

SW761

23

2.5V

55

2.4V

10K

+B

OPEN/CLOSE

0.33/50

1/50

0.01

10/16

0.1/50

25

5V

57

2.4V

24

0V

56

2.4V

R776

26

5V

58

2.4V

C840

C839

C838

837C

835C

27

0V

59

2.4V

28

0V

60

2.4V

29

5V

61

2.4V

30

4.8V

62

0V

31

0V

63

0V

3

1

32

3.8V

64

0V

FW701

R871

64

63

62

61

60

59

58

57

56 55

54 53

52

51

50

49

4.7K

1

C845

3

1

VCC1

LDS

LDD

BH1

PH1

LF2

VR

REFI

VCC2

FSS

DRF CE

DAT

CL

CLK

DEF

48 NC

4.7/50

2

TBC 47

C803

3

E

1 FIN2

FSC 46

0.1/50

R803

4

F

2

FIN1

GND 45

5

TB

SLI 44

15K

C834

R802

6

TE–

0.033

C804

100K

TE

C833

7

0.001

R804

C805

IC801

0.001

R833

LCD701

2.2K

0.033

8

TESI

SLC

43

5.6K

+B

C807

C806

9

SCI

LA9241M

RFS–

42

C830

R832

0.1/50 R805

0.033

SERVO AMP.

2P

6.8K

R806

TH

RFSM 41 (CH)

56K

10

100

CV+ 40

R807

C808

11

TA

15 TO

34 TGL

8

7 6 5

4

3

2

1

C701 0.022 C702 0.022

R708

1K

C809

0.068

12

TD–

16 FD

33 JP+

CV– 39

1K

R710

1K

C810

HFL

37

R809

R709

0.047

SLOF

38

10K

27K

R808

180P

TD

TES 36

R711

12K

13

JP

TOFF 35

2.7K

R811

14

34

AGND NC

3.3K

15

FD–

FA

FA–

FE

FE–

SP

SPG

SP–

SPD SLEQ

SLD

SL–

SL+ JP–

33

16

50

SEG11

P3P40

33

31

R714

17 18

19 20

21

22 23

24

25 26

C816

0.001

27 28

29

30 31 32

48

47

46 45 44 43 42 41 40 39 38 37 36 35 34

+B

R813

C812

R820

10K

49 SEG12

SEG16

COM0 COM1

COM2 COM3

VLC1

VLC2

VLC3

KIDSW AIN7

SIMUKE AIN6

AIN5

VREFP33

32

330P

33K

10K

R824

52

SEG9

29

C705

R828

R812 C813

R814

10K

82K

C815

R821 56K

10K 819C

47/16

C820

.00330

54

SEG7

31

P31

XCIN

27

R829

0.0047

R822

C704

51 SEG10

30

100/10

R817

53

SEG8

32 P32

AVSS 28

1K

15K

0.1

1.2K R826 220K

4MHz

22K

R819

39K

R823 1.2K

C817 0.47/50

R830C818

1K 1/50

R825

R827 220K

59 SEG2

MICROCOMPUTER

XIN 22 1K

1K

55

SEG6

IC701 30 P30

XCOUT 26

0.022

GND

R839

R815 C814 R816

56

SEG5

IX0105AW

VDD 25

22K

VREF

57 SEG4

SYSTEM

VSS

24

58

SEG3

XOUT

23 R713

X701

R840

60 SEG1

POWERIN

18 SQOUT P21

RESET 21

R730 1K

C811

R831

1K

61

P10

MUTED1

RESD3

COCKD4

COIND5

RWCD6

SL+D7 SL–D8

20

SEG0

17 DFR P20

PU-IN P23

R736

62

P00

WRQ P22

19

1K

63 P01

18

64

P02

17

R715

R727

1

2

3

4

5 6

7 8

9 10 11 12 13 14 15 16

15K

R734 1K

1K

+B

5V

R726 1K

DIGITAL GND

R728 1K

PU IN

R729 1K

WRQ

R731 1K

SQOUT

R732 1K

DRF

R733 1K

SL–

SL+

RWC

+B

CO IN

CQCK

10K

15K

15K

15K

15K

15K

15K

15K

15K

RES

D740

1N4148

R716

R718

R719

R720

R722

R723

R725

R721

R724

+B

+B

R741

R742

+B

3.3K

Q740

1K

IC801

IC802

2SC1815 GR

C741

PIN

VOLTAGE

PIN

VOLTAGE

PIN

VOLTAGE

PIN

VOLTAGE

PIN

VOLTAGE

PIN VOLTAGE

R744

NO.

NO.

2.5V

NO.

NO.

NO.

NO.

R740

3.3/50

1

2.5V

23

45

0V

1

0V

23

5V

45

2V

10K

4.7K

2

2.5V

24

2.5V

46

2.5V

2

0V

24

0V

46

0V

3

2.5V

25

2.5V

47

2.5V

3

1.5V

25

0V

47

0.1V

C740

R743

4

2.5V

26

2.5V

48

0V

4

0V

26

0V

48

2.2V

5

2.5V

27

2.5V

49

0V

5

2V

27

0V

49

0V

0.01

R745

100K

6

2.5V

28

2.5V

50

2.4V

6

5V

28

0V

50

2.5V

10K

7

2.5V

29

2.5V

51

4.1V

7

0.3V

29

0V

51

0V

D741

8

2.5V

30

2.2V

52

4.7V

8

0V

30

5V

52

2.5V

9

2.5V

31

2.2V

53

0V

9

2.5V

31

2.5V

53

0V

1N4148

10

2.5V

32

0V

54

0V

10

2.5V

32

0V

54

0V

11

2.5V

33

0V

55

5V

11

0V

33

0V

55

0V

12

2.5V

34

5V

56

5V

12

0V

34

0V

56

4.1V

13

2.5V

35

5V

57

2.5V

13

0V

35

5V

57

4.1V

14

2.5V

36

4.8V

58

2.5V

14

5V

36

4.7V

58

5V

CD SIGNAL

15

2.5V

37

0V

59

0.9V

15

0V

37

2V

59

0V

17

2.5V

39

0V

61

2.1V

17

5V

39

0V

61

2.4V

16

2.5V

38

5V

60

0.9V

16

4.8V

38

0V

60

2.7V

18

2.5V

40

0V

62

4.2V

18

5V

40

2V

62

0V

19

2.5V

41

1.5V

63

0V

19

0V

41

4.7V

63

0V

20

2.5V

42

2.4V

64

5V

20

0V

42

0V

64

0V

21

2.5V

43

2.5V

21

2.5V

43

5V

22

0V

44

2.5V

22

0V

44

2.3V

MAIN PWB(2/2)

• The numbers 1 to 12 are waveform numbers shown in page 17.

1	2	3	4	5	6

Figure 10 SCHEMATIC DIAGRAM (1/4)

– 10 –